#!/usr/bin/env node
const user={
  name:'王顶', 
  age:41,
  qq:'408542507
};
const log=console.log;
log('name:%s',user.name);
log('age:%d',user.age);
log('JSON:%j',user);


log('qq:%s',user.qq);
log('qq:',user.qq);
log('qq:'+user.qq);
log(`qq:${user.qq}`);

console.error('Error! something wrong!');
